“…All patients underwent controlled ovarian superovulation using the long downregulation protocol and either purified urinary FSH (Menopur, Ferring Pharmaceuticals Ltd, Berkshire, UK) or recombinant FSH (Gonal-F, Serono Ltd, Middlesex, UK, or Puregon, Organon Ltd, Cambridge, UK). 6,7 Cycles were cancelled before human chorionic gonadotrophin administration when fewer than three follicles had reached at least 14 mm after 12 days of ovarian stimulation. One to two cleavage-stage embryos were transferred to the uterus on day 2 or 3 after insemination under ultrasound guidance using an Edwards-Wallace embryo transfer catheter (Sims Portex Ltd, Hythe, Kent, UK).…”